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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to have an extra key at hand, whether you dropped your keyfob or it stopped working. This article will go over everything you should be aware of adding, changing, and reprogramming your Mazda 3 key fobs. A word of warning Some keys require programming by a professional locksmith or dealer, while other keys do not. Only use genuine Mazda replacements to replace your key fob. How do I add a spare key? You can also add an additional key if you don't have a spare key, or when you accidentally damage the one you have. You'll need to use the flathead screwdriver, as well as a CR2025 new battery. Once you have the items and tools, you're ready to open the key fob. First find the auxiliary key release button. It's located on the underside of the metal part. It's easy to find. Once you press the button, the cover should slide off immediately. Then, you can insert the screwdriver's head into the notch on top or into the space and pry the metal part off. After the auxiliary keys are removed, insert your new or spare key into the slot. Turn the ignition on and wait for approximately five seconds before turning it to off. This will allow the system to recognize the new key and begin your vehicle in the future. It's important to keep in mind that you can only program up to three keys on your Mazda 3. You don't want to have to use more than two keys to start your vehicle. This is a security precaution that is designed to block unauthorized users, such as valet drivers, from activating your key and thereby launching your vehicle. How to Reprogram a Spare Key It's a good idea to know how you can reprogram a spare key in the event that your original key is lost or stolen. This will stop unauthorised people from starting your car or stealing it. This will work with any Mazda. You will need two keys that are functioning to start the reprogramming process. If you don't have the two working keys, you'll have to bring your vehicle to the dealership to get it done. Begin by stepping into the driver's position, and closing all the doors except the one that is open. Place the first working key into the slot, and then set the ignition to ON. Wait five seconds, then remove the key and repeat the process with a second key. After programming your new key, you'll have three keys that will allow you to start your car in the near future. Before saving each key, be sure it's functioning correctly. It's a good idea to purchase a spare Mazda 3 key fob, especially if you're someone who frequently loses their key or has other issues with it. You can purchase one online or at your local auto retailer, but make sure to read reviews prior to purchasing so you can avoid getting an item that isn't compatible with your vehicle. How do you change the battery using a spare key There's nothing more frustrating than finding that the battery for your key fob has been damaged and you're unable to unlock your car. It's easy to change the battery yourself and save money at the dealer. Press the auxiliary key button on the back of the keyfob. This will detach the key made of metal and reveal the slots on both sides of the case. Put the flathead screwdriver in one of these slots and then gently take apart the two parts of the case. After the battery is fully exposed, take it out of the case and put it somewhere you will not forget it. Be sure to have a replacement battery prior to beginning. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob operates correctly. Then, put the new battery in its place and then replace the cap on the battery. Be careful not to damage the rubber ring that holds the battery. Then press the two halves of the key fob together until you hear an audible click. How to Reset a Keyless Entry System The key fob on your Mazda 3 is not only a convenience, it's also an important security feature. The car will not start if the key is stolen or lost even if you have an extra fob. This is because the fob that you have to be reprogrammed at the dealership in order to work again. It can be a costly and time-consuming process It's a good idea to learn how to reset the system yourself. Remove the battery from the system for 15 minutes. G28 Car Keys Solutions will take out any remaining electrical current from the computer on board. Next, disconnect the LF-ECU and demand switch connectors. Check continuity between the following terminals. Place the key in the slot and switch the ignition on. Switch off the ignition after about five seconds. The key's information will be added to the vehicle's computer, and the new fob will be able to start your vehicle in the future. You can program up to three fobs, however, you should only use one at a time. This will prevent unauthorized persons from copying the key and getting ahold of your vehicle. You can buy a new keyfob on the internet, but it will still need to be programmed and cut by an authorized dealer.